AGRONOMIJAS VÄSTIS - Latvijas LauksaimniecÄ«bas universitÄte

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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 20082520151050AprilMayJuneJulyt, °CAugustSeptemberOctoberNovember2005 2006 Long-termMonthsFigure 1. The mean day-and-night air temperature in the years 2005 and 2006, °C(acc. to Dobele HMS).160150140Precipitations, mm1201008060402017,220,44242,627,64348,624,251651375106,47535,6465956,371,65341,8510AprilMayJuneJulyAugustSeptemberOctoberNovember2005 2006 Long-termMonthsFigure 2. The mean amount of precipitation in the years 2005 and 2006, mm(acc. to Dobele HMS).Analysis of the research and discussionUncontrolled factors: the organic matter content in the soil and the thickness of horizonAp, which are of essential importance in the decision making system on the soil tillagedifferentiation in the aspect of the yields of winter wheat (Figure 3). No linear correlation with theyield was established for the granulometric content of soil characterised in the trials as physicalclay content in soil, %.The thickness cartograms of horizon Ap are appropriate for the differentiation ofpresowing and the postsowing depth of soil tillage the use of which allows site specific reduction ofthe depth of the basic tillage when the thickness of horizon Ap is greater than 36 cm. On theexperimental field it constitutes 60.1 % of the total area (Figure 5). It was established during thefield trials that there is increased organic matter content at the GPS points with an increasedthickness of horizon Ap, which generally reduces the minimisation risk of the presowing tillageand the basic soil tillage, too, in relation to the yields of winter wheat.54
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008t ha -110,08,06,04,02,07,956,376,971,8 2,4 4,3organic matter content in soil, %t ha -19,07,05,03,07,966,396,8630 37 44horizon A p, cmFigure 3. Organic matter content in soil, thickness of horizon A p,and the yield of winter wheat in the year 2006.At the GPS points with an increased organic matter content over 2 % the average thicknessof horizon Ap of 33.4 cm was significantly less (P
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